PanoTools:
Re: How many shots with a Nikon 10.5mm?
tflyfish2002 2006-Jun-04 21:34:19
I have been trying to follow this thread but now I'm lost! Why, if
you are using PTgui, are you bothering with lens parameters at all? As
well as FOV? These will all vary depending on the crop, number of
images used, overlap etc. Why not let Ptgui do it all for you?
Yes, you can mask a tiff image to exclude any area prior to stitching,
but be warned that a large masked out area might result in few found
control points. What I sometimes do is to open the project without
masked images, let PTgui find the control points, optimise and then go
back to photoshop, mask the image as necessary, save it back to the
same location and then run Ptgui to create the Panorama. If you are
masking a Nadir then it seems to matter where in the stack the Nadir
is. I usually put it at the top. It's also worth trying first of all
to let PTgui do the blending, and then trying Smartblend on a smaller
jpg file (Used as a preview) Once you are happy with the result you
then create the panorama to the desired final file size.
Hope this helps.
Barry
-- In #removed#, "Sacha Griffin" <sachagriffin@...> wrote:
>
> How do you use selection? Is this something supported in ptgui?
> That possible could save a preliminary masking step.
>
> Sacha
>
> > panoramicsdk wrote:
> > > When changing the FOV it is always needed
> > > to reoptimize the a b c. Even changing FOV 1 degree will give you
> diffferent parameters.
> > > A fisheye is very different in the outer area and cropping that
> will change everything.
> > >
> > > Here is an image with a 2 image stitch using a 10,5mm on a 20D.
> > > The full circle is here around 176 degree at the corners and 130
> cropped to edge.
> > > http://www.panoramas.dk/technics/10.5mm-circular-crop.jpg
> > >
> > > After optimizing parameters on both you get very different a b but
> the same for c which is
> > > natural as it is the centre. The 2 stitches matches almost perfect.
> > > If I use the parameters for the full 176 degree optimizing and try
> to optimize it without
> > > optimizing a b and c the errros are 30-40 pixels at a 3000 pixels
> panorama.
> > >
> > > Also note that the area cropped off is moved so far out to the
> sides that it will never be
> > > used by the blender.
> > >
> > > And the parameters are of course both also different from what I
> get using fullframe crop.
> > >
> > > Hans
> > >
> > If instead of using crop you use selection, then the original fov is
> > used and none of the abc parameters need reoptimized.
> >
> > # S100,600,100,800 Selection(l,r,t,b), Only pixels inside the
> rectangle will be used for conversion.
> > # Original image size is used for all image
> parameters
> > # (e.g. field-of-view) refer to the original
> image.
> > # Selection can be outside image dimension.
> > # C100,600,100,800 Crop(l,r,t,b), Only pixels inside the rectangle
> will be used for conversion.
> > # Cropped image size is used for all image
> parameters
> > # (e.g. field-of-view) refer to the cropped
> part of the image.
> >
> >
> >
> > --
> > Jim Watters
> >
> > Yahoo ID: j1vvy ymsgr:sendIM?j1vvy
> > jwatters @ photocreations.ca
> > http://photocreations.ca
> >
> >
> >
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